Heney johnson



(No Model.)

H., JOHNSON.

M V PAPER CUTTER. I N0. 257,949. m Patented May 16, 1882.

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UNITED STATES PATENT OFFIC HENRY JOHNSON, OF NEW YORK, N. Y., ASSIGNOR TO M. NICHOLS JOHNSON,

OF SAME PLACE.

PAPER-CUTTER.

SPECIFICATION forming part of Letters Patent No. 257,949, dated May 16, 1882. Application filed October 27, 1880. tNo model.)

providing the outer end of the knife-bar with an inclined slot, in which a pin on the bent hand-lever reciprocates for the purpose of giving the knife the requisite cutting motion.

, My improved paper-cutting machine is represented in the accompanying drawings, in which K is the knife-bar; I, one of its supporting-links; T, the table; S, one of the standards; O, the cross-head, and L the hand-lever. The table, standards, and cross -head are constructed in the usual manner, and the machine is provided with a paper-clamp, arranged to be operated up and down in grooves in the standards by a screw and hand-wheel.

The knife-bar K reciprocates in slots in the standards, and receives the well-known drawing-cut motion from the supporting-links. The knife n is attached to the lower edge of the knife-bar, and the machine is provided with a sliding paper-gage on the table T, as usual.

The hand-lever L, by which the knife-bar and knife are operated, is provided with a bent arm or offset, which projects inward, and is pivoted at a to lugs e on the standard S. In operating the knifebar the lever L swings about the pivotal point a as a fulcrum, the position of the lever and the knife-bar, when the latter has completed its downward stroke, be-

ing shown in dotted lines L K, Fig. 1. The lever is attached to the knife-bar by means of a pin, d, passing through an inclined slot, 0, in the outer end of the knife-bar. The supporting-link l passes through a recess cored for it in the knifebar, and is attached to a pin, which, for convenience of removal, is provided with a thread and nut at one end.

The lever L may be constructed with the bent portion on one side only of the knife-bar; but I prefer, for the purpose of securin g greater strength and durability, especially on machines of large size, to use a bifurcated lever, the inner ends of the bent arms thereof being piv' oted to the lugs econ the standard S on each side of the knife-bar. The pin d is preferably provided with a friction-roller, sliding within the slot 0, as represented by the dotted circle in Fig. 1. As the lever swings outward and downward about the pivotal point a the roller travels backward and forward in the slot 0, imparting a diagonal cutting motion to the knifebar and knife. The downward inclination of the slot 0 in the outer end of the knife-bar enables me to obtain an increased amount of travel for the knife, and it also equalizes the application of the power during the cutting stroke.

I claim- V In combination with the knife and knife-bar of a paper-cutter, having a diagonal cutting motion, the lever L, provided with a bent arm pivoted to the frame at its inner end, and connected to the knife-bar bya pin passing through an inclined slot in the knife-bar, substantially as and for the purposes described.

HENRY JOHNSON.

Witnesses:

GEO. B. SELDEN, O. S. ALDEN. 

